In Western culture, the phases of the Moon have been given the following names, in sequential order:A crescent moon above Earth's horizon is featured in this image photographed by an Expedition 24 cre ...
Pluto has five known natural satellites: Charon, first identified in 1978 by astronomer James Christy; Nix and Hydra, both discovered in 2005, Kerberos, identified by the Hubble Space Telescope in 201 ...
In the 1840s, using Newtonian mechanics, Urbain Le Verrier predicted the position of the then-undiscovered planet Neptune after analysing perturbations in the orbit of Uranus. Subsequent observations ...
Main article: IAU definition of planetStarting in 1801, astronomers discovered Ceres and other bodies between Mars and Jupiter which were for some decades considered to be planets. Between then and ar ...
Charon was discovered by United States Naval Observatory astronomer James Christy, using the 1.55-meter telescope at NOFS, and was formally announced to the world via the International Astronomical Un ...
The semi-major axis is the mean value of the smallest and largest distances from one focus to the points on the ellipse. Now consider the equation in polar coordinates, with one focus at the origin an ...
Ecological disaster Main article: Environmental disasterAn ecological disaster, such as world crop failure and collapse of ecosystem services, could be induced by the present trends of overpopulation, ...
Planetary nebulae have been detected as members in four globular clusters: Messier 15, Messier 22, NGC 6441 and Palomar 6. However, there is currently only one established case of a planetary nebula d ...
Planetary nebulae are generally faint objects; none are visible to the naked eye. The first planetary nebula discovered was the Dumbbell Nebula in the constellation of Vulpecula. It was observed by Ch ...
Once the nucleosynthesis process arrives at iron-56, the continuation of this process consumes energy (the addition of fragments to nuclei releases less energy than required to break them off the pare ...
Stellar evolution begins with the gravitational collapse of a giant molecular cloud. Typical giant molecular clouds are roughly 100 light-years (9.5×1014 km) across and contain up to 6,000,000 solar ...
The first experiments indicating that some plants do not use the established C3 carbon fixation but produce malate and aspartate in the first step were done in the 1950s and early 1960s by Hugo P. Kor ...
Because of the cumbersome nature of expressing certain dimensionless quantities per SI guidelines, the International Union of Pure and Applied Physics (IUPAP) in 1999 proposed the adoption of the spec ...
Carbon-based molecules are crucial for life on earth, because it is the main component of biological compounds. Carbon is also a major component of many minerals. Carbon also exists in various forms i ...
Inorganic compounds can be formally defined with reference to what they are not organic compounds. Organic compounds contain carbon bonds in which at least one carbon atom is covalently linked to an a ...
